The entire heater box comes out as one big piece. Just a little tip, the guys that put these things together years ago used quite a bit of sealant to seal the box to the firewall. You will probably have to use a small crow-bar to get this thing broken loose. It does not take long to get to the heater box, but actually getting it out is another story.

I do not remember having to remove the ignition lock on mine. I may have but don't remember. If you do, it really isn't a big deal to get it out. Removal is basically the same as a 123 body. Do a search and you will see that it is quite easy.

If you run into any other problems let us know. I did this job on mine last spring and helped a friend with his 126 about 3 months ago.

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Mike

'80 300D
'84 300D
'85 300D
'87 300D